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Securing SSH Access for Production Validators
How VolgaChain hardened SSH access across 8 blockchain validator nodes using a bastion host, Ed25519 keys, TOTP two-factor authentication, fail2ban,…
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Backup and Restore Strategies for Blockchain Nodes
SaharaLedger redesigned their blockchain backup strategy after a storage controller failure left two peer nodes offline for 6 hours. This…
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Monitoring Resource Usage with Prometheus Node Exporter
How CaspianTrade built a complete monitoring stack using Prometheus Node Exporter across 32 blockchain hosts in three data centers, with…
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Running Blockchain Nodes as Systemd Services
MeridianChain eliminated 47 minutes of monthly unplanned downtime by converting Hyperledger Fabric nodes to systemd services with dependency ordering, auto-restart,…
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Building an SDP Gateway with OpenZiti on Ubuntu Part 2: Services, Policies, and Client Enrollment
Create PostgreSQL and admin dashboard services on the OpenZiti overlay, define identity-based dial and bind policies, enroll the first remote…
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Building an SDP Gateway with OpenZiti on Ubuntu Part 1: Architecture and Installation
KryptoLedger AG had a VPN credential theft that led to full network compromise. This article deploys OpenZiti on Ubuntu 24.04,…
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SDP vs VPN: A Real-World Performance and Security Comparison
VPNs grant network access. SDPs grant application access. This comparison covers attack surface, lateral movement, latency benchmarks, device posture, and…
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What Is a Software-Defined Perimeter and Why Your Servers Should Be Invisible
Traditional servers expose open ports to every scanner on the internet. Software-Defined Perimeter flips the model: authenticate first, connect second.…
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OpenClaw High Availability and Scaling Part 2: Docker Compose Implementation and Load Testing
Hands-on implementation of OpenClaw HA with Docker Compose: 3 gateway replicas behind Nginx, Redis shared state, health-checked failover, scaling from…